By Margaret Lyons
Updated January 11, 2011 at 03:00 PM EST

Gossip Girl star Ed Westwick has signed on to play a major supporting role as a “clean-cut” F.B.I. agent with a flare for writing in Clint Eastwood’s upcoming J. Edgar, the J. Edgar Hoover biopic written by Dustin Lance Black and starring Leonardo DiCaprio. [Deadline]

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